You PC is overpowered for Sacred 2, everything is processing so fast that Sacred 2 could not keep pace with
Seriously, win 7 is optimal for old games, even win 10 introduced some small problems for me(like I need to run it as admin now, otherwise some creepy server errors)
You cant even run on win10 some games like Vampire: The Masquerade( without fan-made patch, at least)
It was true during game release, I was stunned seeing frozen screen, after transition from S1 to Sacred 2
Now, only CPU can be a weak spot(if AMD card used and non-patched physics)